Tag Heuer. ETA Valjoux 7750 Service

The ETA Valoux 7750 is a very popular movement found in TAG Heuer, Breitling, Omega, IWC, Panerai and many other luxury brand watches.

It is recommended to service this movement every 3 – 5 years.

This watch requires a specific stripping proceedure starting with the ocsillating weight, the dial then the calendar works, followed by the chronograph and autmatic works. Followed by the escapement and train of wheels and then the keyless winding mechanism.

Once stripped the watch is ultrasonicaly cleaned and then assembled following a very specific oiling regime. Special synthetic oils are used, standard watch and clock oil will not do.

Tag Heuer Valjoux 7750

We start by removing the dial and hands.

Valjoux 7750 Rotor

We need to remove the Ocsillating weight.

Weight removed from valjoux 7750

Now we work on removing the calendar work.

Tag Heuer Dial Removed

With the dial off, the calendar work is exposed.

Calendar works Tag Heuer

Now ready to remove the calendar ring and we unscrew the plate it sits on to reveal the hour recording mechanism, the keyless mechanism and the rest of the calendar works.

Under the dial of a tag heuer

Once the components are removed we can then start to dismantle the chronograph and auto mechanism.

Dismantle Tag Heuer Chronograph Mechanism

Removing the tension springs.

tag heuer eta 7750

Now we remove the plate to expose the chronograph and auto mechanism..

Tag Chronograph Mechanism

We can see debris on the chronograph runner wheel and the auto reversing wheel…

This tag needs a clean

Removing the tag heuer chronograph mechanism

Most of the chronograph section is dismantled.

Notice to wear and tear:

This is the train of wheels and the big wheel on the left houses the mainspring (we call this the Barrel).

Removing the keyless work winding mechanism.

ETA Valjoux 7750 Stripped

This is the watch fully stripped – click on the image to make it bigger.


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